pacman: hardcode the architecture in pacman.conf to avoid breaking systems

Without that fix, when creating a chroot with the following commands
on Parabola x86_64, the resulting chroot is 64bit:
    # mkdir rootfs
    # pacstrap -C /usr/share/pacman/defaults/pacman.conf.i686 ./rootfs/
    # file rootfs/usr/bin/pacman
    rootfs/usr/bin/pacman: ELF 64-bit LSB pie executable, x86-64, [...]

In addition, if we run Parabola i686 on an x86_64 computer with
linux-libre-64, and that we try to install packages (after pacman -Sy),
some packages will refuse to be installed because they have
dependencies on 64bit libraries packages while we have 32bit ones
instead:
    # pacman -S e2fsprogs
    resolving dependencies...
    looking for conflicting packages...
    error: failed to prepare transaction (could not satisfy dependencies)
    :: installing e2fsprogs (1.46.5-1) breaks dependency 'libss.so=2-32' required by krb5
    :: installing e2fsprogs (1.46.5-1) breaks dependency 'libcom_err.so=2-32' required by krb5
but packages without such dependencies (like xterm or coreutils) can
be installed without warnings and we end up with non-working
packages:
   # pacman -S xterm
   [the installation proceeds]
   # file /usr/bin/xterm
   /usr/bin/xterm: ELF 64-bit LSB pie executable, x86-64, [...]
   # xterm
   bash: /usr/bin/xterm: No such file or directory

So it's a good idea to hardcode the architecture by default.

The Arch Linux 32 installer uses auto to auto-detect the CPU currently
in use to select matching repositories.

But in Parabola, for x86 32bit we only have one i686 repository and no
pentium4 or i586.

In addition, all the Parabola installers don't depend on auto (the
multi architecture installer has two complete Parabola systems, one
for i686 and one for x86_64, so it doesn't need auto).

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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